叶片-轮盘组件的动力特性研究

本文采用扇形厚板元和波传动法,计算了叶盘组合模型件的振动特性,讨论了组合体与单独叶片及轮盘振动特性的差异,分析了叶盘几何参数变化所产生的影响。文中还对某实际叶盘组件进行了有限元分析,并用实验方法作了检验,结果表明两者是吻合的。 用有限元法计算叶盘组合体振动,有两种较好方法:一种是Kirkhope和Wilson提出,后经Mota Soares等人发展成半解析的环形元法(即有限条法);另一种是后者提出的采用扇形厚板元的波传动法。这两种方法都具有取单元和节点数少、计算精度高等优点,较便于工程应用。然而,这些方法对实际叶盘组件进行计算的经验尚不多,国内外还没有精度高的范例。本文作者经过大量的计算考核,认为对实际叶盘组件的计算拟采用扇形厚板元与厚壳元的组合方案。

A DYNAMIC CHARACTERISTIC ANALYSIS OF A BLADED DISK ASSEMBLY

The dynamic characteristics of a bladed disk assembly are calculated by means of sector elements of thick plates and wave propagation technique of periodical structure. The method saves greatly the computing time and the storage of computer. The vibration characteristics between the bladed disk assembly and the single blade or disk are compared and the influences of the variation of geometric parameters of the bladed disk assembly on its vibration characteristics are considered. Some conclusions are drawn which will play an important part in further research on the vibration control of an aeroengine. A bladed disk assembly of an actual compressor is analyzed in this paper,and the results obtained coincide with the experimental data. Therefore, the presented method is applicable to the practical engineering.